KR102596558B1 - Adhesive label sheet - Google Patents

Abstract

The present invention relates to functional label paper in which the expiration date area is highlighted as time passes. It is formed on the upper surface of the label base paper (10), and is packaged in food packaging (not shown) with the name, country of origin, date of manufacture, and distribution of the food. A printing primer layer (20) on which the expiration date is printed; A plurality of micro holes 30 formed through the label base 10 and the printing primer layer 20; a discoloration display unit 40 formed in the area where the manufacturing date and expiration date are printed, and which changes color as the food decomposes; It is characterized in that it includes an adhesive layer (50) formed on the back of the label base paper (10) and attached to the food package in which the food is packaged.

Description

Functional label paper with expiration date area highlighted over time {Adhesive label sheet}

The present invention relates to functional label paper that is attached (adhesive) to the food packaging in which food is packaged and provides relevant food information. More specifically, it detects deterioration in the packaged food as it progresses and detects the deterioration of the packaged food and detects it by detecting the deterioration of the packaged food and labeling it around the area where the expiration date is printed. It is about functional label paper that highlights the expiration date area over time by highlighting it with a color comparable to that of the label.

In general, food packaging such as livestock products, dairy products, and various prepared foods that are packaged and distributed in packaging containers are distributed with a label printed with the food name, country of origin, manufacturing date, and expiration date of the food.

Food deterioration progresses differentially depending on storage conditions and other tolerances, but the level paper attached to most food packaging uniformly specifies the expiration date or preservation period depending on the type of food. Therefore, even if the food deteriorated rapidly, consumers had no choice but to determine the freshness of the food by simply checking the expiration date on the label.

In this way, because the expiration date is uniformly specified on the label without taking into account the storage condition of the food or other factors, it was difficult to distinguish between foods that had not reached their expiration date but were severely deteriorated due to poor distribution and storage conditions. As people eat (drink) food, their health becomes threatened, such as getting food poisoning.

Meanwhile, in the case of meat, as deterioration progresses, the red color of the meat changes to green, brown, gray, etc., and an unpleasant odor and taste are emitted, and a viscous substance is generated on the surface. However, because the deterioration of meat can only be known when the degree of decomposition has progressed to a certain extent, it was very difficult to determine whether decomposition has progressed in the early stages using only human senses without tools or equipment. Additionally, in order to make an olfactory judgment, the user must smell the bad smell directly, which will greatly increase the user's discomfort.

Accordingly, there is a growing need for technology that protects consumer health by immediately recognizing not only the expiration date printed on the label, but also the point at which food deterioration begins, which is difficult to determine with human senses alone.

The present invention was created to solve the above problems, and when the deterioration of packaged food begins, the expiration date area is displayed in a different color from the surrounding area, allowing the expiration date as well as the condition of the food to be observed more closely. The purpose is to provide functional label paper that highlights the expiration date area as time passes.

Another object of the present invention is to provide a functional label paper whose expiration date area is highlighted over time, which can be recycled as pulp resources when discarded, thereby preventing environmental pollution.

In order to achieve the above object, the functional label paper in which the expiration date area is highlighted as time passes according to the present invention is formed on the upper surface of the label base paper 10, and is packaged in food packaging (not shown). A printing primer layer (20) on which the name, country of origin, manufacturing date, and expiration date are printed; A plurality of micro holes 30 formed through the label base 10 and the printing primer layer 20; a color change display unit 40 formed in the area where the manufacturing date and expiration date are printed, and which changes color as the food decomposes; And an adhesive layer 50 formed on the back of the label base paper 10 and attached to the food package in which the food is packaged.

In the present invention, the micro hole 30 is formed by a needle punch in which numerous needles with a diameter of 0.1 to 0.3 mm are arranged in the horizontal and vertical directions, and the label base paper 10 and the printing primer layer are transferred. It is formed by repeatedly punching (20).

In the present invention, the color change display unit 40 is capable of adsorbing a pH-sensitive indicator whose color changes depending on the pH range, a solvent that dissolves the pH-sensitive indicator, and a gas that is stirred with the solvent. It is formed by transformed ink containing an adsorbent compound.

In the present invention. The color change display unit 40 includes a first index pixel 41a made of a first color change ink that changes color in a specific pH range, and a second index made of a second color change ink having a pH color change range different from that of the first index pixel. A pixel 41b and a third index pixel 41c made of a third discoloration ink having a different pH discoloration range from the first and second index pixels 41a and 41b constitute a unit. It is formed in multiple pieces.

In the present invention, the adhesive layer 50 is implemented by mixing a base composition and a water dissociation composition, and the base composition is Butyl Acrylate and 2-Ethylhexyl Acrylate. ) and polyethylene glycol, methyl methacrylate, methacrylic acid, an emulsifier, and an antifoaming agent, and the water dissociation composition includes ethyl acrylate. Wow, diacetone acrylamide, polypropylene glycol, methyl methacrylate, methacrylic acid, and 2-ethylhexyl acrylate (2 -Ethylhexyl Acrylate), emulsifier, and anti-foaming agent.

In the present invention, the base composition includes 100 parts by weight of the butylacrylate, 90 to 110 parts by weight of the 2-ethylhexyl acrylate, 20 to 30 parts by weight of the polyethylene glycol, and 2 to 2 parts by weight of the methyl methacrylate. Containing 3 parts by weight and 1 to 2 parts by weight of the methacrylic acid, the water dissociation composition includes 100 parts by weight of the ethyl acrylate, 20 to 30 parts by weight of the diacetone acrylamide, and 40 parts by weight of the polypropylene glycol. It includes ~60 parts by weight, 18 to 22 parts by weight of methacrylic acid, and 25 to 35 parts by weight of 2-ethylhexyl acrylate.

In the present invention, in order to obtain the base composition, 100 parts by weight of the butylacrylate, 90 to 110 parts by weight of the 2-ethylhexyl acrylate, and 20 to 30 parts by weight of the polyethylene glycol are added to a reaction vessel and then reacted for 90 to 90 minutes. A first base reactant preparation step (S1-1) in which the first base reactant is prepared by raising the temperature to 110 ° C, stirring at a speed of 60 rpm for 30 minutes, maintaining isotherm for 30 minutes, and then lowering the temperature to 40-50 ° C. , 2 to 3 parts by weight of the methyl methacrylate, 1 to 2 parts by weight of the methacrylic acid (MAA), and 0.4 to 1 part by weight of the antifoaming agent were added to the reaction vessel in which the first base reactant was prepared, and then heated for 90 ~ The second base reactant preparation step (S1-2) of preparing the second base reactant by raising the temperature to 100 ℃ and stirring at a speed of 60 rpm for 20 minutes, maintaining isotherm for 20 minutes, and then lowering the temperature to 40-50 ℃. Perform.

In the present invention, to obtain the water dissociation composition, 100 parts by weight of the ethyl acrylate, 40 to 60 parts by weight of the methyl methacrylate, 20 to 30 parts by weight of the diacetone acrylamide, and the polypropylene are added to a reaction vessel. After adding 40 to 60 parts by weight of glycol, the temperature was raised to 90 to 100 ° C, stirred for 30 minutes at a speed of 60 rpm, and then maintained isothermally for 30 minutes and lowered to 40 to 50 ° C to prepare the first water dissociation reactant. In the step (S2-1) of preparing a first water dissociation reactant, 18 to 22 parts by weight of methacrylic acid and 25 to 35 parts by weight of 2-ethylhexyl acrylate are added to the reaction vessel in which the first water dissociation reactant is prepared. parts by weight, 2 to 2.6 parts by weight of the emulsifier, and 0.4 to 1 part by weight of the antifoaming agent are added, then the temperature is raised to 80 to 100 ℃ and stirred at a speed of 60 rpm for 30 minutes, and then the temperature is lowered to 40 to 50 ℃. Perform the addition step (S2-2).

According to the present invention, not only does it attach to food packaging to provide food information, but also displays the expiration date area in a different color from the surroundings when the packaged food begins to deteriorate, allowing for more detailed observation of the expiration date as well as the condition of the food. This can reduce the possibility of consuming spoiled food.

In addition, as the adhesive layer 50 formed on the back of the label base paper 10 is dissociated into water, the functional label paper separated from the food packaging can be stirred in water and recycled into pulp without any stickiness, making it possible to recycle it as a resource. Not only can it be preserved, but it can also prevent environmental pollution.

1 is a diagram illustrating an embodiment of a printed label in which the expiration date area is highlighted over time according to the present invention;
Figure 2 is a cross-sectional view taken along line II-II in Figure 1;
Figure 3 is a diagram illustrating the progress of discoloration in the discoloration display unit as food deterioration progresses in the functional label paper of Figure 1;
FIG. 4 is a diagram illustrating the detailed configuration of the color change display unit of FIG. 3.

Hereinafter, the functional label paper in which the expiration date area is highlighted as time passes according to the present invention will be described in detail with reference to the attached drawings.

Hereinafter, the term “above” or “above” may include not only what is directly above in contact but also what is above without contact. Terms such as first, second, etc. may be used to describe various components, but the components should not be limited by the terms. Terms are used only to distinguish one component from another. Singular expressions include plural expressions unless the context clearly dictates otherwise. Additionally, when a part "includes" a certain component, this means that it may further include other components rather than excluding other components, unless specifically stated to the contrary. Additionally, terms such as "...unit" and "module" used in the specification refer to a unit that processes at least one function or operation. In cases where an embodiment can be implemented differently, a specific process sequence may be performed differently from the described sequence. For example, two processes described in succession may be performed substantially at the same time, or may be performed in an order opposite to that in which they are described.

Figure 1 is a diagram for explaining an embodiment of a printed label in which the expiration date area is highlighted over time according to the present invention, Figure 2 is a cross-sectional view taken along line II-II of Figure 1, and Figure 3 is a This is a diagram to explain the progress of discoloration in the discoloration display portion of the functional label in Figure 1 as food deterioration progresses. And FIG. 4 is a diagram for explaining the detailed configuration of the color change display unit of FIG. 3.

As shown, the functional label paper 100, which highlights the expiration date area over time according to the present invention, is formed on the upper surface of the label base paper 10, and is the name of the food packaged in the food packaging (not shown). , a printing primer layer (20) on which the country of origin, manufacturing date, and expiration date are printed; A plurality of micro holes (30) penetrating the label base paper (10) and the printing primer layer (20); a discoloration display unit 40 that is formed in the area where the manufacturing date and expiration date are printed and changes color as the food decomposes; It is characterized in that it includes an adhesive layer (50) formed on the back of the label base paper (10) and attached to the food package in which the food is packaged.

The label base 10 is a paper material made of cellulose fibers that has an appropriate size and shape that can be attached to an article and can be recycled into relatively low-density tissue paper such as toilet paper, toilet tissue, table napkins, paper towels, etc. It becomes.

The printing primer layer 20 is where information such as food name, country of origin, manufacturing date, and expiration date is printed, and ensures that the ink sprayed from the label printer is clearly transferred.

The printing primer layer 20 transfers the water-based acrylic resin applied to the transfer roller by partially immersing and rotating the transfer roller in the water-based acrylic resin contained in a water tank and passing the label base paper 10 in close contact with the rotating transfer roller. It is formed by the gravure method.

At this time, the water-based acrylic resin transferred to the upper surface of the label base paper 10 is dried by passing the label base paper 10 through a drying roller heated to 100-150°C or applying heat from a blowing heater, and through this process, the label is dried. A printing primer layer 20 with a thickness of 0.1 to 10 micrometers, or 1 micrometer in this embodiment, is formed that permeates the upper surface of the base paper 10.

As shown in FIG. 2, the micro hole 30 is formed by a needle punch in which numerous needles with a diameter of 0.1 to 0.3 mm, preferably 0.2 mm, are arranged in the horizontal and vertical directions, and the label base paper being transferred is formed. It is formed by repeatedly punching (10) and the printing primer layer (20). By this needle punch, the micro holes 30 are formed in a matrix form in the label base 10 and the printing primer layer 20 in the horizontal and vertical directions. These micro holes 30 guide gases (chemical substances) generated when food deteriorates in food packaging to the discoloration display unit 40 so that they can be detected by the discoloration display unit 40.

Here, if the diameter of the needle constituting the needle punch is 0.1 mm or less, the micro hole 30 is blocked due to the physical properties of the label base paper 10, and if it is 0.3 mm or more, the information printed on the printing primer layer 20 is blocked. It gets crushed and becomes hard to see.

The discoloration display unit 40 is formed in the area of the printing primer layer 20 where the manufacturing date and expiration date are printed. The discoloration display unit 40 is implemented by applying a discoloration ink that changes color in response to the pH of chemicals generated when food spoils.

The color-changing ink forming the color-changing display portion 40 includes a pH-sensitive indicator whose color changes depending on the pH range, a solvent that dissolves the pH-sensitive indicator, and a substance that is stirred with the solvent and can adsorb gas. Contains adsorption compounds. Examples of such pH-sensitive indicators include phenolphthalein, methyl red, methyl yellow, thymol blue, and bromothymol blue.

Meanwhile, as shown in FIG. 4, the color change display unit 40 includes a first index pixel 41a made of a first color change ink that changes color in a specific pH range, and a first index pixel 41a having a pH change range different from the first index pixel. The second index pixel (41b) made of two discoloring inks and the third index pixel (41c) made of third discoloring ink having a different pH discoloration range from the first and second index pixels (41a) (41b) form one unit. It is formed by forming a plurality of discolored pixels 41.

For example, the first index pixel 41a is discolored by gases (chemicals) generated when land meat such as pigs or cows deteriorate, and the second index pixel 41b is discolored by gases (chemicals) generated when vegetables deteriorate. It is discolored by gas, and the third index pixel 41c is discolored by gas generated when legume foods such as tofu deteriorate.

As the color change display unit 40 is composed of wall color pixels 41 that form the first, second, and third index pixels 41a, 41b, and 41c as one unit, it is possible to prevent deterioration that occurs at an unspecified time in various materials that make up food. As a result, the corresponding index pixel is discolored, and as a result, the entire discoloration display unit 40 is discolored to a specific color, allowing the consumer to check the manufacturing date and expiration date printed on the discoloration display unit 40.

Furthermore, even if the expiration date remains, it is possible to prevent unexpected food poisoning accidents by providing an opportunity to carefully observe the packaged food again for deterioration.

The adhesive layer 50 is formed on the back of the label base paper 10 on which the micro holes 30 are formed, and attaches (adheres) the label base paper 10 to the food packaging material P in which the food is packaged.

The adhesive layer 50 is implemented by applying an adhesive obtained by mixing a base composition and a water-dissociable composition.

The base composition is Butyl Acrylate, 2-Ethylhexyl Acrylate, Poly Ethylene glycol, Methyl Methacrylate, and Methacrylic Acid. Acid), emulsifier, and antifoaming agent.

Emulsifiers allow the compositions to mix together to form a stable emulsion.

Antifoaming agents are used to remove air bubbles in the finished adhesive composition, and water-soluble surfactants with low volatility and high diffusivity are used.

This base composition contains 100 parts by weight of butylacrylate, 90 to 110 parts by weight of 2-ethylhexyl acrylate, preferably 100 parts by weight, 20 to 30 parts by weight of polyethylene glycol, preferably 25 parts by weight, and methyl 2 to 3 parts by weight of methacrylate, preferably 2.5 parts by weight, 1 to 2 parts by weight of methacrylic acid, preferably 1.5 parts by weight, and 1.4 to 2 parts by weight of emulsifier, preferably 1.7 parts by weight. , the antifoaming agent is composed of 0.4 to 1 part by weight, preferably 0.7 part by weight.

To obtain this base composition, first, 100 parts by weight of butyl acrylate, 90 to 110 parts by weight of 2-ethylhexyl acrylate, and 20 to 30 parts by weight of polyethylene glycol were added to a reaction vessel, and then the temperature was raised to 90 to 110°C and the reaction mixture was heated at 60 rpm. The first base reactant preparation step (S1-1) is performed by stirring for 30 minutes at a speed of , maintaining isotherm for 30 minutes, and then lowering the temperature to 40-50°C.

Next, 2 to 3 parts by weight of methyl methacrylate, 1 to 2 parts by weight of methacrylic acid (MAA), and 0.4 to 1 part by weight of defoaming agent were added to the reaction vessel in which the first base reactant was prepared, and the temperature was raised to 90 to 100 ° C. The second base reactant preparation step (S1-2) is performed by stirring for 20 minutes at a speed of 60 rpm, maintaining isotherm for 20 minutes, and then lowering the temperature to 40-50°C.

Through this series of first base reactant preparation steps (S1-1) and second base reactant preparation steps (S1-2). A base composition is prepared.

The water dissociation composition includes ethyl acrylate, diacetone acrylamide, polypropylene glycol, methyl methacrylate, and methacrylic acid. Acid), 2-Ethylhexyl Acrylate, emulsifier, and anti-foaming agent.

The water dissociation composition is 100 parts by weight of ethyl acrylate, 20 to 30 parts by weight of diacetone acrylamide, preferably 25 parts by weight, 40 to 60 parts by weight of polypropylene glycol, preferably 50 parts by weight, and meta Composition ratio of 18 to 22 parts by weight of clinic acid, preferably 20 parts by weight, 25 to 35 parts by weight of 2-ethylhexyl acrylate, preferably 30 parts by weight, and 2 to 2.6 parts by weight of emulsifier, preferably 1, It consists of 3 parts by weight and 0.4 to 1 part by weight, preferably 0.7 parts by weight, of an antifoaming agent.

To obtain this water dissociation composition, first, add 100 parts by weight of ethyl acrylate, 40 to 60 parts by weight of methyl methacrylate, 20 to 30 parts by weight of diacetone acrylamide, and 40 to 60 parts by weight of polypropylene glycol into a reaction vessel. After raising the temperature to 90-100 ℃, stirring at a speed of 60 rpm for 30 minutes, maintaining isotherm for 30 minutes, and then lowering the temperature to 40-50 ℃, preparing the first water dissociation reactant. Perform (S2-1)

Next, 18 to 22 parts by weight of methacrylic acid, 25 to 35 parts by weight of 2-ethylhexyl acrylate, 2 to 2.6 parts by weight of an emulsifier, and 0.4 to 1 part by weight of an antifoaming agent were added to the reaction vessel in which the first water dissociation reactant was prepared. After the addition, the temperature is raised to 80-100°C, stirred for 30 minutes at a speed of 60 rpm, and then the second additive addition step (S2-2) is performed by lowering the temperature to 40-50°C.

A water-dissociated composition is prepared through the first water-dissociated reactant preparation step (S2-1) and the second additive addition step (S2-2).

The adhesive of the present invention is implemented by mixing 20 to 30 parts by weight of the water dissociation composition, preferably 25 parts by weight, with 100 parts by weight of the base composition prepared through the above series of steps.

The adhesive layer 50 implemented with the above composition and ratio has a thickness ranging from 10 to 30㎛, preferably 20㎛. If the thickness of the adhesive layer 50 is less than 10㎛, the adhesive layer 50 may be easily peeled off from the article due to pressure applied from the outside due to insufficient adhesiveness, and if the thickness exceeds 30㎛, the entire label paper becomes too thick.

The adhesive prepared with the above composition and composition ratio is dissolved in pure water without the use of chemicals and is completely water-dissociated leaving no residue in the form of lumps. Therefore, the adhesive layer 50 made of such adhesive can be water-dissociated without leaving any residue by simply placing the functional label paper 100 in water and stirring it, so that only the label base paper 10 made of pulp remains, Afterwards, when further stirred, the label base paper 10 is unraveled and recovered as pulp. There is no sticky adhesive component remaining in the recovered pulp, and it is recycled as recycled pulp.

In this way, according to the present invention, not only does it attach to food packaging to provide food information, but also displays the expiration date area in a different color from the surroundings when the packaged food begins to deteriorate, so that the expiration date as well as the condition of the food can be better identified. By observing closely, you can reduce the possibility of consuming spoiled food.

In addition, as the adhesive layer 50 formed on the back of the label base paper 10 is dissociated into water, the functional label paper separated from the food packaging can be stirred in water and recycled into pulp without any stickiness, making it possible to recycle it as a resource. Not only can it be preserved, but it can also prevent environmental pollution.

The present invention has been described with reference to an embodiment shown in the drawings, but this is merely illustrative, and those skilled in the art will understand that various modifications and other equivalent embodiments are possible therefrom.

100 ... functional label paper 10 ... label base paper
20... Printing primer layer 30... Micro holes
40 ... discoloration display unit 41 ... discoloration pixel
41a, 41b, 41c ... 1st, 2nd, 3rd index pixel 50 ... Adhesive layer

Claims (8)

A printing primer layer (20) formed on the upper surface of the label base paper (10), on which the name, country of origin, manufacturing date, and expiration date of the food packaged in the food packaging (not shown) are printed;
A plurality of micro holes (30) penetrating the label base paper (10) and the printing primer layer (20);
a color change display unit 40 formed in the area where the manufacturing date and expiration date are printed, and which changes color as the food decomposes;
It includes an adhesive layer (50) formed on the back of the label base paper (10) and attached to the food package in which the food is packaged;
The adhesive layer 50 is implemented by mixing a base composition and a water dissociation composition;
The base composition includes butyl acrylate, 2-Ethylhexyl Acrylate, poly ethylene glycol, methyl methacrylate, and methacrylic acid ( Methacrylic Acid), emulsifier, and anti-foaming agent;
The water dissociation composition includes ethyl acrylate, diacetone acrylamide, polypropylene glycol, methyl methacrylate, and methacrylic acid ( Methacrylic Acid, 2-Ethylhexyl Acrylate, emulsifier, and anti-foaming agent;
The base composition includes 100 parts by weight of the butylacrylate, 90 to 110 parts by weight of the 2-ethylhexyl acrylate, 20 to 30 parts by weight of the polyethylene glycol, and 2 to 3 parts by weight of the methyl methacrylate, Containing 1 to 2 parts by weight of the methacrylic acid,
The water dissociation composition includes 100 parts by weight of the ethyl acrylate, 20 to 30 parts by weight of the diacetone acrylamide, 40 to 60 parts by weight of the polypropylene glycol, and 40 to 60 parts by weight of the methyl methacrylate. , A functional label paper in which the expiration date area is highlighted over time, comprising 18 to 22 parts by weight of methacrylic acid and 25 to 35 parts by weight of 2-ethylhexyl acrylate. The method of claim 1, wherein the micro hole 30 is,
A needle punch consisting of a plurality of needles with a diameter of 0.1 to 0.3 mm arranged in the horizontal and vertical directions is formed by repeatedly punching the conveyed label base paper 10 and the printing primer layer 20. A functional label that highlights the expiration date area over time. The method of claim 1, wherein the color change display unit 40 is,
It is formed by a modified ink containing a pH-sensitive indicator whose color changes depending on the pH range, a solvent that dissolves the pH-sensitive indicator, and an adsorption compound that can adsorb gas when stirred with the solvent. A functional label that highlights the expiration date area as time passes. The method of claim 1, wherein the color change display unit 40 is,
A first index pixel (41a) made of a first discoloring ink that changes color in a specific pH range, a second index pixel (41b) made of a second discoloring ink having a pH discoloration range different from that of the first index pixel, and The third index pixel (41c) made of a third discoloration ink having a pH discoloration range different from the first and second index pixels (41a) (41b) is formed by forming a plurality of discoloration pixels (41) forming one unit. A functional label that highlights the expiration date area as time passes. delete delete The method of claim 1, wherein to obtain the base composition,
100 parts by weight of the butylacrylate, 90 to 110 parts by weight of the 2-ethylhexyl acrylate, and 20 to 30 parts by weight of the polyethylene glycol were added to the reaction vessel, and then the temperature was raised to 90 to 110 ° C. for 30 minutes at a speed of 60 rpm. A first base reactant preparation step (S1-1) of preparing the first base reactant by stirring, maintaining isotherm for 30 minutes, and then lowering the temperature to 40-50 ° C.
Into the reaction vessel in which the first base reactant was prepared, 2 to 3 parts by weight of the methyl methacrylate, 1 to 2 parts by weight of the methacrylic acid (MAA), and 0.4 to 1 part by weight of the antifoaming agent were added, and then 90 to 100 parts by weight. The second base reactant preparation step (S1-2) is performed by raising the temperature to ℃ and stirring at a speed of 60 rpm for 20 minutes, maintaining isotherm for 20 minutes, and lowering the temperature to 40~50 ℃. Functional label paper in which the expiration date area is highlighted as time passes. The method of claim 1, wherein in order to obtain the water dissociation composition,
100 parts by weight of the ethyl acrylate, 40 to 60 parts by weight of the methyl methacrylate, 20 to 30 parts by weight of the diacetone acrylamide, and 40 to 60 parts by weight of the polypropylene glycol were added to the reaction vessel, and then 90 to 100 parts by weight. The first water dissociation reactant is prepared by stirring at a speed of 60 rpm for 30 minutes while raising the temperature at ℃, maintaining isotherm for 30 minutes, and then lowering the temperature to 40-50 ℃, in the preparation step (S2-1) )and,
In the reaction vessel in which the first water dissociation reactant was prepared, 18 to 22 parts by weight of methacrylic acid, 25 to 35 parts by weight of 2-ethylhexyl acrylate, 2 to 2.6 parts by weight of the emulsifier, and 0.4 to 1 part by weight of the antifoaming agent. After adding parts by weight, the temperature is raised to 80-100°C, stirred for 30 minutes at a speed of 60 rpm, and then the temperature is lowered to 40-50°C. The second additive addition step (S2-2) is performed. Functional label paper in which the expiration date area is highlighted as the product passes.

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